asexual reproduction
DESCRIPTION
Asexual Reproduction. Mitosis s. Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?. 1. Animated Mitosis Cycle. http://www.cellsalive.com/mitosis.htm. Interphase Prophase Metaphase Anaphase - PowerPoint PPT PresentationTRANSCRIPT
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Asexual ReproductionMitosiss
Mitosis is the process in which the nucleus divides to form two new nuclei. How does mitosis differ in plants and animals?
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Animated Mitosis Cyclehttp://www.cellsalive.com/mitosis.htm
• Interphase• Prophase• Metaphase• Anaphase• Telophase & Cytokinesis
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Interphase occurs before mitosis begins
• Chromosomes are copied (# doubles)• Chromosomes appear as threadlike coils
(chromatin) at the start, but each chromosome and its copy(sister chromosome) change to sister chromatids at end of this phase
CELL MEMBRANENucleus
Cytoplasm
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InterphaseAnimal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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Prophase 1st step in Mitosis
• Mitosis begins (cell begins to divide)• Centrioles (or poles) appear and begin to
move to opposite end of the cell. • Spindle fibers form between the poles.
CentriolesSister chromatids
Spindle fibers
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ProphaseAnimal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
Spindle fibers
Centrioles
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Metaphase 2nd step in Mitosis
• Chromatids (or pairs of chromosomes) attach to the spindle fibers.
Centrioles
Spindle fibers
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MetaphaseAnimal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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Anaphase 3rd step in Mitosis
• Chromatids (or pairs of chromosomes) separate and begin to move to opposite ends of the cell.
Centrioles
Spindle fibers
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AnaphaseAnimal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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Telophase 4th step in Mitosis
• Two new nuclei form. • Chromosomes appear as chromatin (threads
rather than rods).• Mitosis ends.
NucleiNuclei
Chromatin
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TelophaseAnimal Cell Plant Cell
Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm
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Cytokinesisoccurs after mitosis
• Cell membrane moves inward to create two
daughter cells – each with its own nucleus with identical chromosomes.
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Cell Cycle
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